What should the units do if there is a sudden power outage across the entire plant?
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If there is a sudden power outage across the entire plant and the emergency generators fail to start, the exhaust temperature becomes very high and the bearing temperatures keep rising. Let’s discuss how to deal with this situation
Power outage; there is a high-level fuel tank, and the amount of fuel there is sufficient to meet the needs of the unit during shutdown.
The fuel in the high-position tank is only enough to last for 6 minutes; what if cooling isn’t achieved within those 6 minutes? Moreover, the increase in rotor temperature is mainly due to heat transfer from the cylinder, and it is a gradual process; the high-level oil tank simply cannot achieve the desired effect. What do you think?
The oil pump should be equipped with a backup power supply so that it will not stop operating in the event of a power failure.
You’re referring to the emergency generator. The problem now is: what should be done if that emergency generator also fails, for example due to damage caused by long-term disuse, or if it fails to provide power in a timely manner?
The high-level oil tank serves as a backup in case the oil pump loses power or fails, preventing the bearings from grinding dry. The temperature of the rotor should not be too high; otherwise, even if the oil pump keeps running, the bearing temperatures will remain very high!
After a power outage, there is nothing to do but wait. Based on the information provided by the poster, it is necessary to calculate the amount of cooling oil required for emergency shutdown, and to select a high-capacity oil tank accordingly. Rectifications are carried out during major overhauls to ensure there is sufficient oil volume to lower the shaft temperature.
Under normal circumstances, imported equipment is not equipped with a high-level oil tank, and the oil pump is provided with a backup power source.
The backpressure turbine oil station in the chemical plant has two oil pumps: one driven by an electric motor and the other by steam. There is also a high-position fuel tank. In thermal power plants, the large condensing steam turbines are equipped with DC motors for startup in emergency situations, to ensure a supply of lubricating oil.
What is your crew’s idle time? Can it last that long? Besides, steam heat transfer isn’t as complicated as you say
Methods for dealing with the barring motor after it stops under abnormal conditions: • 1. Verify that the lubricating oil and jacking oil are in normal condition； • 2. Perform manual turning of the rotor on-site at a rate of 15° every 15 minutes, until the expander meets the temperature requirements ； • 3. If there is a problem with the oil system and conditions for turning the shaft by hand are not available, it is necessary to wait until the unit has cooled down completely before starting the oil system and manually turning the shaft. Check whether the sound of the gears is normal; only if it is normal can the motor for turning the shaft be started. • 4. The high-level oil sump is designed to provide lubrication during the period when the unit stops operating under abnormal conditions, allowing the rotor to come to a complete stop (run down), thereby preventing thermal bending of the rotor.